Implants based on engineered metal matrix composite materials having enhanced imaging and wear resistance

A metal matrix, implant technology

Inactive Publication Date: 2006-08-09
WARSAW ORTHOPEDIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, traditional materials with good abrasion resistance properties often have poor imaging properties
Other materials have acceptable imaging properties but poor abrasion resistance

Method used

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  • Implants based on engineered metal matrix composite materials having enhanced imaging and wear resistance
  • Implants based on engineered metal matrix composite materials having enhanced imaging and wear resistance
  • Implants based on engineered metal matrix composite materials having enhanced imaging and wear resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0122] Example: Wear Test Comparison of Titanium Carbide Metal Matrix Composites and Stainless Steel

[0123] Three stainless steel (316L SS) and metal matrix composite (MMC, (TiC+Ti 6 Al 4 V)) sample for multi-station, linear reciprocating tip-to-plate wear test. Pointed samples have a spherical tip with a radius of 100mm. The samples were polished according to the method described by Varano et al. (ORS 2003) and tested under a load of 9.81 N at an average velocity of 26 mm / s at room temperature. The lubricant contained 25% calf serum in distilled water and was changed frequently during the 0.75 million cycle (Mc) test. Volume loss was estimated from mass loss measurements. For each pair of samples, the run-in wear rate (slope of the linear fit of the data from zero up to 0.1 Mc) and the steady state wear rate (slope of the linear fit of the data after 0.1 Mc) were calculated. The result is as Figure 20 shown.

[0124] Initially, the two material pairs have different ...

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PUM

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Abstract

This invention relates to an implantable medical device to treat a patient. The implantable device can be an orthopedic device such as a spinal implant including, but not restricted to, a disc or nucleus pulposus prosthesis, a spinal rod assembly, or a bone fixation plate. The orthopedic device can be formed to include a metal matrix composite that provides enhanced wear and diagnostic imaging techniques. In other forms, the present invention provides an implantable medical device that includes a porous metal matrix composite that can deliver a therapeutic composition to a patient. In still other forms, the present invention provides an implantable electrical device or lead formed to include a metal matrix composite that provides lower polarization and interfacial impedance and allows enhanced sensing of the physiological signals.

Description

[0001] This application claims priority to US Provisional Patent Application 60 / 474,696, filed May 30, 2003, which is hereby incorporated by reference in its entirety. Background of the invention [0002] The present application relates to medical implants comprising metal matrix composites and to methods of implanting such implants into patients in need of treatment. Implants of the invention can be used to treat chronic or acute diseases. [0003] Currently, the natural segmented bone-articular structure can be replaced by ceramic, polymeric or metallic materials or combinations thereof. For example, joints such as knees, hips, and intervertebral discs can be replaced with artificial joints. It is very important that the prosthetic joint has good biocompatibility and favorable wear properties, minimizing any scratching or surface abrasion with accompanying debris entering the surrounding tissue. Typically, patients undergoing knee or hip replacement are in their sixties or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/44A61F2/06A61L27/40A61L27/42A61L27/56A61L31/12A61L31/14A61N1/05A61B17/70A61B17/80A61F2/00A61F2/02A61F2/30A61F2/32A61F2/38
CPCA61F2310/00203A61F2/38A61F2002/3008A61L27/56A61F2310/00269A61F2310/00305A61F2002/443A61L27/427A61F2/4425A61F2/442A61F2310/00239A61F2002/30062A61F2310/00095A61F2240/001A61F2310/00167A61F2/30965A61F2250/0098A61F2310/00089A61B17/7001A61F2/32A61L31/146A61F2002/30971A61B17/7052A61F2002/30968A61N1/05A61B17/7059A61F2002/30677A61B17/80A61F2310/00323A61F2310/00023A61F2210/0004A61L31/124A61B17/7049A61F2310/00263B33Y80/00A61F2/44A61B17/60A61L27/06A61B17/70
Inventor N·伊斯泰法诺斯G·C·马利克J·F·莱萨尔D·F·恩泰瑞克
Owner WARSAW ORTHOPEDIC INC
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